Yuki Mitani

A player at the Go Club at Haze Middle School who overcomes his cheating habit. He is angry at Hikaru for choosing to be an Insei rather than stay at the school Go club when they have a tournament around the corner. Yuki and Hikaru are no longer seen as friends. Yuki remains in the Go club but only after much convincing. His birthday is October 15th. Source: Wikipedia